linux-kernel - Re: RTC wakealarm file is missing in v6.1-rc1

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Date:   Mon, 17 Oct 2022 21:32:50 -0700
From:   Todd Brandt <todd.e.brandt@...ux.intel.com>
To:     linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org
Cc:     rafael.j.wysocki@...el.com, alexandre.belloni@...tlin.com
Subject: Re: RTC wakealarm file is missing in v6.1-rc1

On Mon, 2022-10-17 at 19:19 -0700, Todd Brandt wrote:
> In the v6.1-rc1 kernel release from about 24 hours ago, the wakealarm
> file for the real time clock appears to be missing. Specifically:
> 
> /sys/class/rtc/rtc0/wakealarm
> 
> Without this sysfs file, the rtcwake and sleepgraph tools no longer
> function properly (and probably all tools that use the RTC through
> sysfs). I've tested on 10 machines so far and this occurs on all of
> them regardless of the specific hardware.
> 
> The issue is in this patch set for the rtc subsystem. If I remove
> this
> commit and rebuild, the issue goes away. I'm in the process of
> bisecting further.
> 
> commit b7270c69a36efc61ed6ebd31a8a458f354a6edc0
> Merge: 4ce1b97949cb e5f12a398371
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Fri Oct 14 18:36:42 2022 -0700
> 
> I've opened a bugzilla issue here:
> https://bugzilla.kernel.org/show_bug.cgi?id=216600
> 
I've bisected this issue to a single commit. I recommend that this
commit be reverted immediately while Raphael creates a fix. It breaks
linux tools that use the rtc wakealarm.

commit 4919d3eb2ec0ee364f7e3cf2d99646c1b224fae8
Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Date:   Wed Oct 12 20:07:01 2022 +0200

    rtc: cmos: Fix event handler registration ordering issue